Decorating local Li plus solvation structure and optimizing solid electrolyte interphase with potassium trifluoroacetate for dendrites-free lithium metal anodes

文献类型： 外文期刊

第一作者： Zeng, T.

作者： Zeng, T.;Shu, C.;Yan, Y.;Du, D.;Xu, H.;Wen, X.;Liu, S.;Tian, G.;Wang, X.;Zeng, Y.;Wu, L.

作者机构：

关键词： Electrolyte additive; Potassium tri fluoroacetate; Li plus solvation environment; Electrode -electrolyte interphase; Dendrites -free Li deposition

期刊名称：MATERIALS TODAY NANO （ 影响因子：10.3； 五年影响因子：10.6 ）

ISSN： 2588-8420

年卷期： 2023 年 23 卷

页码：

收录情况： SCI

摘要： Fabricating a stable and robust solid electrolyte interphase to realize the dendrites-free lithium (Li) deposition morphology in the existing commercial electrolytes remains challenging. Here, the cost-effective potassium trifluoroacetate is proposed as an electrolyte additive, in which TFA- anions have the capability to involve in constructing solid electrolyte interphase with abundant inorganic species by modulating local Li+ solvation structure. It is found that TFSI- and NO3- anions in the electrolyte can be recruited into Li+ primary solvent sheath to replace partial solvent molecules confirmed by classical molecular dynamic simulations. This is due to the strong polar interaction between TFA- anions and Li+, which is favorable for weakening the coordination of solvent molecules proved by density functional theory calculation. Besides, with the assistance of electrostatic shielding of K+, the Li deposition morphology is greatly improved. Benefiting from the potassium trifluoroacetate additive, Li+ trans-ference number (tLi+) of 0.68, considerable ionic conductivity (sLi+) of 8.93 x 10-4 S cm-1, and stable cycling over 400 h at 1.0 mA cm-2 are obtained. Moreover, the full cells coupling with LiFePO4 cathode exhibit a low overpotential of 212.41 mV and high capacity retention of 87.67% after 283 cycles under the current density of 1.0 C.& COPY; 2023 Elsevier Ltd. All rights reserved.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序